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Process for manufacturing an asphalt paving mixture

A technology of asphalt mixture and mixture, which is applied in the field of preparing asphalt mixture and paving mixture, and can solve problems such as difficult handling of iron sulfide

Inactive Publication Date: 2012-10-10
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, iron sulfide can be difficult to handle and readily reacts with moisture in the air, so it is desirable to find alternative means of reducing the release of hydrogen sulfide from sulfur-containing asphalt mixtures

Method used

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  • Process for manufacturing an asphalt paving mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] Styrene or vinyltoluene is reacted with elemental sulfur or SEAM pellets. SEAM pellets consist primarily of sulfur and are available from Shell Canada Limited.

[0041] 50 g of each sulfur sample was mixed with 50 g of hot PG64-28 grade bitumen in a metal can and placed on a hot plate set at a surface temperature of 160°C. Immediately after mixing the sulfur sample and the bitumen, a filter paper lid with a central hole in the top was placed over the metal canister. Hydrogen sulfide release was measured with a Draeger MiniWarn gas meter fitted with a pump through a hose inserted into the gas space of the tank. The hydrogen sulfide measurement range is 1-100ppm.

[0042] Table 1 shows the peak hydrogen sulfide readings for each sample:

[0043] Table 1

[0044] Styrene /

vinyl toluene

SEAM Pill /

sulfur

sulfur product of the reaction

(g)

asphalt

(g)

temperature

(℃)

Peak H 2 S reading

(ppm)

none ...

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PUM

PropertyMeasurementUnit
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Abstract

A process for manufacturing an asphalt paving mixture is disclosed. The process comprises the steps of : i) heating bitumen at a temperature of from 100 to 200 DEG C; ii) heating aggregate at a temperature of from 100 to 20 DEG C; and iii) mixing the hot bitumen with the hot aggregate in a mixing unit. From 10 to 200 wt% of sulphur pellets, based upon the weight of the bitumen, are added in at least one of the steps (i), (ii) or (iii). The sulphur pellets comprise from 1 to 50wt% of a monovinyl aromatic compound, based upon the weight of the sulphur pellets.

Description

field of invention [0001] The present invention relates to a process for preparing an asphalt paving mixture, wherein sulfur is incorporated into said asphalt paving mixture. Background technique [0002] In the road building and road laying industry, a well practiced procedure is to coat aggregates such as sand, gravel, crushed stone or mixtures thereof with hot fluid bitumen, while the coated material is still hot In this case it is spread as a uniform layer on a subgrade or previously built road, and the uniform layer is compacted by rolling with heavy rollers to form a road with a smooth surface. [0003] The combination of bitumen (bitumen) and aggregates such as sand, gravel, crushed stone or mixtures thereof is called "asphalt". Bitumen, also known as "asphalt binder," is generally a liquid binder comprising bitumen, resins, and solvents. Bitumen may, for example, comprise retort mixtures derived from petroleum residues such as residues, tars or wood pitch or mixtur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/06C04B22/02C04B26/26
CPCC04B22/02C04B26/26
Inventor I·迪梅
Owner SHELL INT RES MAATSCHAPPIJ BV